RESUMO O sistema de poda do mirtileiro (Vaccinium asheiRead

v-aos incomparáveis amigos que encontrei no IPE/USP, vários dos quais foram companheiros de bandejão e de finais de semana na sala de estudos. A todos sou muito grato pela amizade, pelo companheirismo e por tudo o que pude aprender, como pessoa e como acadêmico:

Worldwide, peach propagation has been performed mainly by grafting scions of desirable cultivars on rootstocks obtained from seeds. There are, however, other potential propagation methods not widely adopted due to the limited reports on the field performance of the resultant trees. This study addressed this knowledge gap and investigated the field performance of peach trees of the cultivar Maciel that were established in an orchard (5.0 m × 1.4 m spacing) in 2011. The trees were trained in a "Y" system, with seedlings from three propagation techniques: 1) Conventional System (CS) -vegetative bud grafting of the scion on the rootstock of the Okinawa cultivar obtained from seed; 2) Rootstock by Minicutting (RM) -vegetative bud grafting of the scion on the rootstock of the Okinawa cultivar obtained by minicutting in a semi-hydroponic system; 3) Self-Rooting (SR) -self-rooting of the scion in a semihydroponic system. The vegetative, productive, and fruit quality parameters were assessed during 2012 and 2013. The Maciel peach trees that were propagated by the SR technique were found to have similar or even superior field performance to those propagated by the CS. The RM propagation method was also found to be an important potential alternative to peach propagation, since this it combines two techniques (cutting and grafting) to reduce tree vigor, especially if the goal is high-density planting. Key words: Prunus persica. Cloning. Self-rooting. Minicutting. ResumoEm todo o mundo, a propagação de pessegueiro tem sido realizada principalmente por enxertia de cultivares copa em porta-enxertos obtidos a partir de sementes. No entanto, existem outros métodos de propagação potenciais que não são amplamente adotados devido à pouca informação em relação ao desempenho a campo das plantas. A fim de responder a esta pergunta, em 2011, pessegueiros da cultivar Maciel foram plantados (5,0m ×

Worldwide, peach propagation has been performed mainly by grafting scions of desirable cultivars on rootstocks obtained from seeds. There are, however, other potential propagation methods not widely adopted due to the limited reports on the field performance of the resultant trees. This study addressed this knowledge gap and investigated the field performance of peach trees of the cultivar Maciel that were established in an orchard (5.0 m × 1.4 m spacing) in 2011. The trees were trained in a "Y" system, with seedlings from three propagation techniques: 1) Conventional System (CS) - vegetative bud grafting of the scion on the rootstock of the Okinawa cultivar obtained from seed; 2) Rootstock by Minicutting (RM) - vegetative bud grafting of the scion on the rootstock of the Okinawa cultivar obtained by minicutting in a semi-hydroponic system; 3) Self-Rooting (SR) - self-rooting of the scion in a semi-hydroponic system. The vegetative, productive, and fruit quality parameters were assessed during 2012 and 2013. The Maciel peach trees that were propagated by the SR technique were found to have similar or even superior field performance to those propagated by the CS. The RM propagation method was also found to be an important potential alternative to peach propagation, since this it combines two techniques (cutting and grafting) to reduce tree vigor, especially if the goal is high-density planting.

The use of mini-cuttings in the production of peach seedlings may prevent the inconvenience of grafting and make possible the fast, simple and low-cost production of a great number of seedlings, in a shorter period of time. Seedlings collection from self-rooted scion cultivars may be an option for locations where the use of rootstock does not offer any specific advantage. The objective of the present experiment was to evaluate the growth and survival of self-rooted peach scion cultivars cloned through mini-cutting under the soilless cultivation system and in packages with commercial substrate, in a greenhouse. The experimente used rooted herbaceous mini-cuttings from the Maciel and Bonão scion cultivars transplanted to a package with commercial substrate and to a soilless cultivation system as vegetal material. The Maciel cultivar showed greater rooting and survival percentages after transplantation when compared to Bonão. At 120 days after transplantation to the cultivation systems, self-rooted seedlings from the Maciel and Bonão cultivars reached half the length of a commercially ready seedling. The soilless cultivation system improves self-rooted peach seedlings development in relation to production in packages.